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ce7b1c4f1d
Implements drop-in replacement for actions/cache using S3 backend and OverlayFS for delta caching: - xahau-actions-cache-restore: Downloads immutable base + optional latest delta - xahau-actions-cache-save: Saves immutable bases (bootstrap/partial-match) or timestamped deltas (exact-match) Key features: - Immutable bases: One static base per key (first-write-wins, GitHub Actions semantics) - Timestamped deltas: Always-timestamped to eliminate concurrency issues - Configurable use-deltas parameter (default true): - true: For symbolic keys (branch-based) - massive bandwidth savings via incremental deltas - false: For content-based keys (hash-based) - base-only mode, no delta complexity - Three cache modes: bootstrap, partial-match (restore-keys), exact-match - OverlayFS integration: Automatic delta extraction via upperdir, whiteout file support - S3 lifecycle ready: Bases tagged 'type=base', deltas tagged 'type=delta-archive' Decision rule for use-deltas: - Content-based discriminator (hashFiles, commit SHA) → use-deltas: false - Symbolic discriminator (branch name, tag, PR) → use-deltas: true Also disables existing workflows temporarily during development.